ClassLib/
|
|-- Interfaces
|   |- IOrder
|   | -IPayment
|
|-- Implementations
|   |- Order
|   |- Payment

ClassLib/
|
|-- Interfaces
|   |- IOrder
|   | -IPayment
|
|-- Implementations
|   |- Order
|   |- Payment

ClassLib/
|
|-- Orders
|   |- IOrder
|   |- Order
|
|-- Payments
|   |- IPayment
|   |- Payment

ClassLib/
|
|-- Orders
|   |- IOrder
|   |- Order
|
|-- Payments
|   |- IPayment
|   |- Payment

c#
public class Dog
{
    public Guid Id {get; set; }
    public string Alias {get; set; }

    public Owner Owner { get; set; } // navigation property
}

c#
public class Dog
{
    public Guid Id {get; set; }
    public string Alias {get; set; }

    public Owner Owner { get; set; } // navigation property
}

c#
  private static void Configure(EntityTypeBuilder<Dog> builder)
  {
      builder.HasOne(b => b.Owner)
          .WithMany()
          .HasForeignKey("OwnerId");
      
      builder.HasIndex(b => new { "OwnerId", b.Alias })   // Can't do this, but this is what I want to achieve
          .IsUnique();
  }

c#
  private static void Configure(EntityTypeBuilder<Dog> builder)
  {
      builder.HasOne(b => b.Owner)
          .WithMany()
          .HasForeignKey("OwnerId");
      
      builder.HasIndex(b => new { "OwnerId", b.Alias })   // Can't do this, but this is what I want to achieve
          .IsUnique();
  }

c#
#if DEBUG
// Code specific to development environment (e.g., relaxed validation)
#else
// Code specific to production environment (e.g., stricter validation)
#endif

c#
#if DEBUG
// Code specific to development environment (e.g., relaxed validation)
#else
// Code specific to production environment (e.g., stricter validation)
#endif

c#
#if DEVELOPMENT
[DevelopmentIsValidHostnameFormat]
#else
[IsValidHostnameFormat]
#endif

public string? Hostname{ get; set; }

c#
#if DEVELOPMENT
[DevelopmentIsValidHostnameFormat]
#else
[IsValidHostnameFormat]
#endif

public string? Hostname{ get; set; }

c#
public class Animal
{
    public int Id { get; set; }
    public string? Name { get; set; }
}

c#
public class Animal
{
    public int Id { get; set; }
    public string? Name { get; set; }
}

c#
_dbContext.Animals.Select(a => new Animal {Id = a.Id})

c#
_dbContext.Animals.Select(a => new Animal {Id = a.Id})

c#
_dbContext.Animals.Select(a => SelectOnlyNeeded(a))

private Animal SelectOnlyNeeded(Animal a) {
  return new Animal {Id = a.Id};
}

c#
_dbContext.Animals.Select(a => SelectOnlyNeeded(a))

private Animal SelectOnlyNeeded(Animal a) {
  return new Animal {Id = a.Id};
}

c#
private static Animal SelectOnlyNeeded(this Animal a) {
  return new Animal {Id = a.Id};
}

c#
private static Animal SelectOnlyNeeded(this Animal a) {
  return new Animal {Id = a.Id};
}

c#
public abstract class Animal
{
    public int Id { get; set; }
    public string? Name { get; set; }
}
public class Cat : Animal
{

}
public class Dog : Animal
{
    public Owner Owner { get; set; }
}

c#
public abstract class Animal
{
    public int Id { get; set; }
    public string? Name { get; set; }
}
public class Cat : Animal
{

}
public class Dog : Animal
{
    public Owner Owner { get; set; }
}

c#
_dbContext.Animals.Include(a => (a as Dog).Owner)

c#
_dbContext.Animals.Include(a => (a as Dog).Owner)

c#
public class User
{
    public string UserId { get; set; }
}

public class Domain
{
    public Guid DomainId { get; set; }
    public string DomainName { get; set; }

    public User User { get; set; }
}

c#
public class User
{
    public string UserId { get; set; }
}

public class Domain
{
    public Guid DomainId { get; set; }
    public string DomainName { get; set; }

    public User User { get; set; }
}

c#
    public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
    }

c#
    public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
    }

c#
    public void Configure(EntityTypeBuilder<Domain> builder)
    {
        builder.HasKey(d => d.DomainId);

        builder.HasOne(d => d.User)
            .WithMany()
            .HasForeignKey(d => d.UserId)
            .IsRequired(false);

        builder.HasIndex(d => d.DomainName)
            .IsUnique();

        var sharedDefaultDomainName = new Domain
        {
            DomainId = Guid.NewGuid(),
            UserId = null,
            DomainName = "localhost:7151",
        };

        builder.HasData(sharedDefaultDomainName);   //Here
    }

c#
    public void Configure(EntityTypeBuilder<Domain> builder)
    {
        builder.HasKey(d => d.DomainId);

        builder.HasOne(d => d.User)
            .WithMany()
            .HasForeignKey(d => d.UserId)
            .IsRequired(false);

        builder.HasIndex(d => d.DomainName)
            .IsUnique();

        var sharedDefaultDomainName = new Domain
        {
            DomainId = Guid.NewGuid(),
            UserId = null,
            DomainName = "localhost:7151",
        };

        builder.HasData(sharedDefaultDomainName);   //Here
    }

| Users |
 -------
| Id PK |

and

| OtherTable |
 ------------
|    Id PK   |
| UserId FK  |
| Value INT  |

| Users |
 -------
| Id PK |

and

| OtherTable |
 ------------
|    Id PK   |
| UserId FK  |
| Value INT  |